Boat davit



Feb. I0. 1925.

' H. w.' BROADY BOAT DAVIT Filed June 14'. 1921 s ts-sneet 2` Feb. 10, l1925.l I

H. BROADY BOAT DAVIT FiiedJune 14. 1921 :s sheets-sheet s.

Patented lelo. lh, i925 tlNlTElll HARRY W. IBB/GABY, Ol? BAYSIDE, NEUW YORK,

` anatra anni orales.

BY `MESNE ASSIGNMENTS,

TO W'ELN DP-.Vl 66 BOAT GRPGRTIOH, fr COREQRATEON 0l? NEW' YORK.

:BOAT DAVIT.

Application le. June .1.4, 1921.

.To all '107mm t may concern:

Be it. 4known that l, HARRY W. BiroADY, a citizen of the United States, and a resident of Bayside, borough of Queens, county of Queens, and State of New Yorlr, have invented certain new and useful lmprovements in Boat Davits, of which the following is a specification.

This invention relates to improvements in boat davits.

One of the objects of this invention is to provide a davit arm, (and preferably a davit of the type in which the arm is pivotally supported intermediate its ends to swing `in a vertical plane and having a toothed segment at its lower end which rolls upon a rack fixed to the deck of a vessel.) with a lower end of foot portion which is bent orcurved laterally below the pivoted point to counterbalance and eliminate lateral or tilting `strain of the load on the pivotal support, rand such lower end or foot portion is preferably so bentlaterally in the direction of the pull of the load that the line indicating the resultant direction of the strain of the load on the davit arm will pass through the foot of the clavit, thus eliminating all lateral or tilting strain of the load upon the intermediate pivotal support and also counterbalancing any overhang ofthe top of the davit arm.

Another feature of my invention coniprises the provision in a davit of the type above specified, of a sectional bearing for the pivot, a portion of which may be removed to provide an opening for the insertion of a headed pivot so that the davit arm may be assembled withthe frame and pivotal supporting parts by a simple elevation and lowering thereof over the headed pivot and the `subsequent insertion of the sectional bearing plate to complete the pivot bearing for the davit arm.

lith these and other objects in view, the invention comprises the combination of members and arrangement ofparts so combined as to cofact and cooperate with each other in the performance of the functions and the accomplishment of the results herein contemplated, and comprises in one of its adaptations the species or preferred form illustrated in the accompanying drawings, in which Fig. l is a side elevation of a davit ein. bodying my improvements; l

Serial No. 4724274.

Fig. 2 is an end elevation of the davit shown in Fig. l;

3 is a section on the line 3--3 of Fig. l; Y

fl is a section through the lower end of the davit frame showing the raclr and base of the Said frame;

Fig. 5 is an enlarged fragmentary view of the pivoted portion of the davit arm, illustrating the method of mounting the davit on the pivot thereof, and Fig. 6 is an outline or diagrammatic view of the inboard end of a davit arm and frame with the op @rating mechanism omitted for the sake of clearness, and having Y dot-and-dash lines drawn to indicate the direction of strain of the two lines from the point of suspension to the frame; the resultantof these two lines; the direction of the pull of the load from the point of suspension, and the resultant direction of the strain of the load on the davit.

Referring now to these drawingsR l indi- Cates one of a pair of davits, each compris ing a davit arm having at its lower ond a toothed segment 2 and pivoted intermediate its ends at 3 on a pivot connected with a combined sleeve and nut ll, the sleeve d being mounted to slide upon a rod 5 suitably supported in the frame 6 and the nut 4l" being threaded on a screw 7 also sup ported in the frame G for rot-ary movement but not for longitudinal movement. As il lustrated, the traine G is provided with a base portion Gd and said base portion has formed integrally therewith a rack 8 dis posed at one side of the center of such base portion. The davit arm is, as shown, provided with acurved lower end or foot portion la which extends laterally in the direction of the overhang l at the top of the davit arm, from an eye 10 in which overhang, the boat 11 is suspended. This lower end (see particularly Figs. 3, l and 6) provided with a toothed segment 2 which meshes with the rack 8, y and also has a marginal flange 9 which shuts against the rack at one side and the rack is preferably provided with an upwardly extending lange 8L which abuts against the segmental toothed lower end at the opposite side of the rack. It will be seen that in a davit of this type in which the lower end of the arm is bent or curved laterally in the direction of the pull or strain of the load, .the lstrain ofthe load such as a boat on the pivotal support may be partiallybr entirely counter-balanced and eliminated, and it the said lower end or foot is so bent that the toothed segment 2 extends inwardly to the line indicatingl the resultant direction of the strain of the load and meshes with the rack 8 at this line, the strain of the load upon the intermediate pivotal support will be entirely eliminated. and any overhanging portion at the top of the davit arm,` which overhanging portion is usual in order to facilitate the suspension of a boat Yfrom the top ot the davit arm, will be counterbalanced.

In Fig. 6, I have shown, in outline, the inboard end of a davit arm mounted in a frame with the operating mechanism and supports therefor omitted for the sake of clearness, and in this view I have indicated by a dot-and-dash line the direction or line of the strain of the load from the eye 10 or point of suspension on the upper end of the davit arm to the fixed eye 6b on the trarne; by another dot-and-dash line, I have indicated the direction or line of strain of the load from the said point of suspension over the pulley 6C on thc trame; by another similar line, I have indicated the resultant direction or line of strain of the aforesaid two lines; by still another similar line, I have indicated the direction ot the load from said point of suspension; and by still another similar line, I have indicated the resultant direction of the strain of the load on the davit, and it will be seen that the foot of the davit is extended a suiiicient distance laterally to cause this last-mentioned resultant line to pass through the same and this is substantially true in all positions as the davit rolls in its movement from inboard to outboard positions and vice versa.

In davits ot this type it is desirable to make the frame and davit arm independently and to assemble the same on thc ship or at the place where the same is to be used, and iu order to facilitate such assembly it is desirable that the pivot be provided with an integral head and as illustrated the pivot 3 is provided with an integral head 3a and the davit arm 1 is mounted upon the said headed pivot by providing a sectional bearing for the pivot, the top portion of said bearing 1d being formed integrally in the davit arm and the bottom portion 1c being formed of a removable plate bolted to the davit arm by bolts le, or in any other suitable manner, so that in assembling the plate 1c may be removed to form an opening into which the headed pivot may be passed upon a slight elevation or raising of the davit arm and which when lowered will permit the portion 1d to fit over the pivot and between the head thereof and the frame, and so that when the plate 1c is applied the sectional bearing for the pivot will be completed and the davit arm will be securely mounted in place.

Obviously, a rotation of the screw 7 will cause the nut lb to travel along the same, and when, as illustrated, the nut is connected with the pivot 3 on which the davit arm is pivotally mounted intermediate its ends, the segment 2 at the lower end of said arm will be caused to roll along the rack 8 so to cause the said arm to travel inboard and outboard and at the same time to have a pivotal movement about the pivot 3. Any suitable means may be employed for rotating the screw 7, and, as illustrated, I have provided a gear 12 mounted on the end of the screw shaft 7 which is journaled in the frame 6, and this gear 12 meshes with a pinion 13 on a shaft 14 supported at opposite ends in brackets 15 and 16 and jointly rotatable by a hand-wheel 17 and crank-handle 18.

I-Iaving described my invention I claim 1. A davit for raising and lowering ships boats comprising a davit arm supported and pivoted intermediate its ends to cause the pivoted portion to swing in a vertical plane and having at its upper end means for connecting` a load thereto and also having at its lower end a portion bent to one side of said vertical plane in which the pivoted portion swings and adapted to counter-balance the tilting strain of the load.

2. A pair of davits for raising and lowering ships boats, comprising a pair of davit arms pivoted intermediate their ends and having at their upper end means for connecting and suspending a boat therebetween` each of said davits having at its lower end a portion bent to extend toward the other member of the pair and in the direction of the strain of the suspended boat.

3. A davit for raising and lowering ships boats comprising` a davit arm supported and pivoted intermediate its ends to cause the pivoted portion to swing in a vertical plane and havingat its upper end means for connecting a load thereto, and also having at its lower end a portion bent to one side of said vertical plane in the direction of the strain of the load and extending to a line indicating the resultant direction of the strain of the load.

4. A davit for raising and lowering ships boats comprising a davit arm supported and pivoted intermediate its ends to cause the pivoted portion' to swing in a vertical plane and having at its upper end means for connecting a load thereto, and also having at its lower end a portion bent to one side of said vertical plane in the direction ot the strain of the load and extending to a line indicating the resultant direction of the strain of the load, a toothed segment on seid lower end, e rack on which said segment may roll and means for movingthe pivot nboard and outboard to swing the davt arm vertically.

5. A davt for raising and lowering ships boats comprising a devt arm, a pvot arranged intermediate the ends of said davt erm about which the dzwt may turn, an overhanging portion at the top of said davt Adrm, e curved foot portion at the lower end of said arm extending in the same direction es the overhangng portion, a, toothed segment on said lower end7 a rack on which said segment may roll, e screw Jfor movn lng the pvot to swing the davit arm Ver tcally, seid screw being located at the side of the davt arm opposite to the curved lower end.

In Witness whereof, I have signed my name to the foregoing specification in the 20 presence of two subscribing Witnesses.

HARRY BROADY.

lVtnesses WALTER J. HENRY, HELEN V. WHIDDEN. 

